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International System of Units — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/International_System_of_Units
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-15T18:17:37.331Z
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International System of Units — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/International_System_of_Units (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_3534bdfd89c0 (Metraipolis archive dc_3534bdfd89c0, sha256 337242946bce0c5d1bd14b1484d16f99a40ddf6615773d60fc84c78d73be89ae)

BibTeX

@misc{dc3534bdfd89c0,
  title = {International System of Units — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/International_System_of_Units},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_3534bdfd89c0; sha256 337242946bce0c5d1bd14b1484d16f99a40ddf6615773d60fc84c78d73be89ae},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/International_System_of_Units. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The International System of Units, internationally known by the abbreviation SI (from its official French name, Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce. The International Bureau of Weights and Measures (abbreviated BIPM from French: Bureau international des poids et mesures) coordinates the SI. The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol: s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number of additional quantities. These are called coherent derived units, which can always be represented as products of powers of the base units. Twenty-two coherent derived units have been provided with special names and symbols. The 7 base units and the 22 coherent derived units with special names and symbols may be used in combination to express other coherent derived units. Since the sizes of coherent units will be convenient for only some applications and not for others, the SI provides 24 prefixes which, when added to the name and symbol of a coherent unit produce 24 additional (non-coherent) SI units for the same quantity; these non-coherent units are always decimal (i.e. power-of-ten) multiples and sub-multiples of the coherent unit. The current way of defining the SI is a result of a decades-long move towards definitions of the units that do not depend on artefacts made as physical realisations. A consequence is that as science and technologies develop, new and potentially superior realisations may be introduced without the need to redefine the unit. One problem with artefacts is that they can be lost, damaged, or changed; another is that they introduce uncertainties that cannot be reduced by advancements in science and technology. The original motivation for the development of the SI was the diversity of units that had sprung up within the centimetre–gram–second (CGS) systems (specifically the inconsistency between the systems of electrostatic units and electromagnetic units) and the lack of coordination between the various disciplines that used them. The General Conference on Weights and Measures (French: Conférence générale des poids et mesures – CGPM), which was established by the Metre Convention of 1875, brought together many international organisations to establish the definitions and standards of a new system and to standardise the rules for writing and presenting measurements. The system was published in 1960 as a result of an initiative that began in 1948, and is based on the metre–kilogram–second system of units (MK

Tema degli esploratori: agenti e intelligenza artificiale (deposito sistematico; ricerca «prompt engineering»).
Fonte: Wikipedia in inglese, voce «International System of Units» — https://en.wikipedia.org/wiki/International_System_of_Units
Wikidata Q12457 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q12457
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/International_System_of_Units?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1377822310, consultata il 2026-10-15T17:46:45.590Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 791164774efbd175180e8d47b354032fb80031a0930c9c9b6db9e0c0f58b1c5e